r - Extract integer value from a character string -


i have character in form "radiance_mult_band_1 = 1.2412e-02" saved in variable. want extract integer value 0.012412. please suggest syntax in r.

# function extract number string f = function(x) { y = unlist(strsplit(x, " ")) y = as.numeric(y) y = y[!is.na(y)] y }   # having 1 value x = "radiance_mult_band_1 = 1.2412e-02"  f(x)  # [1] 0.012412   # having multiple values dt = data.frame(x = c("radiance_mult_band_1 = 1.2412e-02",                       "radiance_mult_band_2 = 1.5412e-02",                       "radiance_mult_band_3 = 2.2412e-02"), stringsasfactors = f)  dt$value = f(dt$x)  dt  #                                   x    value # 1 radiance_mult_band_1 = 1.2412e-02 0.012412 # 2 radiance_mult_band_2 = 1.5412e-02 0.015412 # 3 radiance_mult_band_3 = 2.2412e-02 0.022412

Comments

Post a Comment

Popular posts from this blog

php - Vagrant up error - Uncaught Reflection Exception: Class DOMDocument does not exist -

i've set bento/ubuntu-16.04 vagrant box using php 5.6, , getting following error quite few times when try , run shell script: "uncaught reflection exception: class domdocument not exist". i've tried adding following top of script (not together), each no success: "sudo apt-get install php5.6-xml", "sudo apt-get install php5-xml", "sudo apt-get install php-dom" i've tried resetting server "sudo service apache2 restart". does have suggestions?
Read more

vue.js - Create hooks for automated testing -

Image
qa guys complained can't automate frontend testing. because our html looks same outside. lazy hack did this <template> <div :role="$options.name"> ... </div> </template> <script> export default { name: 'vmcomponentname' } </script> which takes name script , applies html. in browser get: <div role="vmcomponentname"> ... </div> line :role="$options.name" goes in every component. is there dry er solutions? please share. additional details i'll explain in details looking for. imagine have vmusercreate form creates user. test case can create user . to automatically test without role, have use following selector: .wrapper > .wrapper > .wrapper > .submit-button the test extremely brittle (will break lot). if use roles can use [role="vmusercreateform"] .submit-button selector. many folds less brittle. so basically, i'm
Read more

.htaccess - ERR_TOO_MANY_REDIRECTS htaccess -

could can explain me .htaccess code doing? rewriterule ([0-9]+)/([^t]{1}[a-za-z0-9_-]{0,})\.([^s]{1}[a-za-z0-9]+)$ ../items/go.php?u=$1/$2.$3 i have folder : mywebsite.com/download/folder1/ .htaccess file in uplevel mywebsite.com/download/ folder contains code above. when access file directly path mywebsite.com/download/folder1/file.mp4 returns error : mywebsite.com redirected many times. try clearing cookies. err_too_many_redirects i tried clear browser cookies issue persist. issue solved when commented out htaccess line above. this rule appears looking specific pattern consisting of: <numbers>/<alphanumeric string not starting t , other conditions applied>.<alphanumeric string not starting s> then redirecting user's browser go.php parsed filename passed file arguments. err_too_many_redirects due infinite redirect loop. without knowing other rewriterule statements present difficult narrow down exact cause. can narrow down
Read more